70年代中后期清华大学研制成功了氮化硅(Si3N4)陶瓷刀具和复合氮化硅陶瓷刀具,引起了国内外学术界和工业界的关注和兴趣。经过几度改进,这种新型刀具已具有非常高的耐磨性、红硬性和抗冲击韧性,它的推广应用将给金属切削工艺带来重大革新,改变传统的刀具材料和切削技术。采 In the late 1970s, Tsinghua University successfully developed silicon nitride (Si3N4) ceramic tools and composite silicon nitride ceramic knives, aroused the concern and interest of academics and industry at home and abroad. After several improvements, this new tool already has a very high resistance to abrasion, red hardness and impact toughness. Its widespread adoption will bring significant innovations to the metal cutting process, changing the traditional cutting tool and cutting technology. Mining